I've done it ! For fuck sake I've done it !

Qwirkle/QwirkleClassLibrary/Games/Game.cs

@@ -401,8 +401,13 @@ namespace QwirkleClassLibrary.Games
 
 
 
-public int GetPlayerScore(Player player, ReadOnlyCollection<Cell> cellsPlayed, Board b)
+        public int GetPlayerScore(Player player, ReadOnlyCollection<Cell> cellsPlayed, Board b)
         {
+            if (cellsPlayed.Count == 0)
+            {
+                return 0;
+            }
+            
             int score = cellsPlayed.Count;
             
             int cellsX = cellsPlayed[0].GetX;
@@ -414,11 +419,15 @@ public int GetPlayerScore(Player player, ReadOnlyCollection<Cell> cellsPlayed, B
                 {
                     cellsX = -1;
                 }
+                
                 else if (cellsY != cell.GetY && cellsY != -1)
                 {
                     cellsY = -1;
                 }
+            }
             
+            foreach (var cell in cellsPlayed)
+            {
                 score += CalculateAdjacentScore(cell, b, cellsPlayed, cellsX, cellsY);
             }